Update Telecom test app to support bluetooth for self-managed calls.

Add support for bluetooth route in the telecom test app.
Also, update the test connectionservice to set mediaplayer properties so
that its speech uses the correct audio attributes to more accurately
emulate how a real voip app would do things.

And yes, the buttons are now emojis in the test UI. :)

Bug: 78770358
Test: Manually tested.
Change-Id: I69c595fef852717caad38719abf33911dec3dd86